Multiple selected/deselected cells for layer 1/layer 2 based mobility

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless communication device may identify a plurality of cells associated with serving a user equipment (UE), where each cell of the plurality of cells has been either selected for serving the UE or deselected for serving the UE. The first wireless communication device may transmit an indication of the plurality of cells associated with serving the UE to a second wireless communication device, where the indication includes information indicating whether each cell of the plurality of cells has been selected for serving the UE or has been deselected for serving the UE. Numerous other aspects are provided.

CROSS-REFERENCE TO RELATED APPLICATIONS

This Patent application claims priority to U.S. Provisional PatentApplication No. 62/952,900, filed on Dec. 23, 2019, entitled “MULTIPLESELECTED/DESELECTED CELLS FOR LAYER 1/LAYER 2 BASED MOBILITY,” andassigned to the assignee hereof, and to U.S. Provisional PatentApplication No. 62/967,305, filed on Jan. 29, 2020, entitled “MULTIPLESELECTED/DESELECTED CELLS FOR LAYER 1/LAYER 2 BASED MOBILITY,” andassigned to the assignee hereof. The disclosures of the priorApplications are considered part of and are incorporated by referenceinto this Patent Application.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication and to techniques and apparatuses for multipleselected/deselected cells for layer 1 (L1)/layer 2 (L2) based mobility.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, and/or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless communication network may include a number of base stations(BSs) that can support communication for a number of user equipment(UEs). A user equipment (UE) may communicate with a base station (BS)via the downlink and uplink. The downlink (or forward link) refers tothe communication link from the BS to the UE, and the uplink (or reverselink) refers to the communication link from the UE to the BS. As will bedescribed in more detail herein, a BS may be referred to as a Node B, agNB, an access point (AP), a radio head, a transmit receive point (TRP),a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipment to communicate on a municipal, national,regional, and even global level. New Radio (NR), which may also bereferred to as 5G, is a set of enhancements to the LTE mobile standardpromulgated by the Third Generation Partnership Project (3GPP). NR isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingorthogonal frequency division multiplexing (OFDM) with a cyclic prefix(CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g.,also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) onthe uplink (UL), as well as supporting beamforming, multiple-inputmultiple-output (MIMO) antenna technology, and carrier aggregation.However, as the demand for mobile broadband access continues toincrease, there exists a need for further improvements in LTE and NRtechnologies. Preferably, these improvements should be applicable toother multiple access technologies and the telecommunication standardsthat employ these technologies.

SUMMARY

In some aspects, a method of wireless communication, performed by afirst wireless communication device, may include identifying a pluralityof cells associated with serving a UE, wherein each cell of theplurality of cells has been either selected for serving the UE ordeselected for serving the UE; and transmitting an indication of theplurality of cells associated with serving the UE to a second wirelesscommunication device, wherein the indication includes informationindicating whether each cell of the plurality of cells has been selectedfor serving the UE or has been deselected for serving the UE.

In some aspects, a method of wireless communication, performed by afirst wireless communication device, may include identifying a pluralityof cell groups associated with serving a UE, wherein each cell group ofthe plurality of cell groups has been either selected for serving the UEor deselected for serving the UE; and transmitting an indication of theplurality of cell groups associated with serving the UE to a secondwireless communication device, wherein the indication includesinformation indicating whether each cell group of the plurality of cellgroups has been selected for serving the UE or has been deselected forserving the UE.

In some aspects, a first wireless communication device for wirelesscommunication may include memory and one or more processors operativelycoupled to the memory. The memory and the one or more processors may beconfigured to identify a plurality of cells associated with serving aUE, wherein each cell of the plurality of cells has been either selectedfor serving the UE or deselected for serving the UE; and transmit anindication of the plurality of cells associated with serving the UE to asecond wireless communication device, wherein the indication includesinformation indicating whether each cell of the plurality of cells hasbeen selected for serving the UE or has been deselected for serving theUE.

In some aspects, a first wireless communication device for wirelesscommunication may include memory and one or more processors operativelycoupled to the memory. The memory and the one or more processors may beconfigured to identify a plurality of cell groups associated withserving a UE, wherein each cell group of the plurality of cell groupshas been either selected for serving the UE or deselected for servingthe UE; and transmit an indication of the plurality of cell groupsassociated with serving the UE to a second wireless communicationdevice, wherein the indication includes information indicating whethereach cell group of the plurality of cell groups has been selected forserving the UE or has been deselected for serving the UE.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a firstwireless communication device, may cause the one or more processors to:identify a plurality of cells associated with serving a UE, wherein eachcell of the plurality of cells has been either selected for serving theUE or deselected for serving the UE; and transmit an indication of theplurality of cells associated with serving the UE to a second wirelesscommunication device, wherein the indication includes informationindicating whether each cell of the plurality of cells has been selectedfor serving the UE or has been deselected for serving the UE.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a firstwireless communication device, may cause the one or more processors to:identify a plurality of cell groups associated with serving a UE,wherein each cell group of the plurality of cell groups has been eitherselected for serving the UE or deselected for serving the UE; andtransmit an indication of the plurality of cell groups associated withserving the UE to a second wireless communication device, wherein theindication includes information indicating whether each cell group ofthe plurality of cell groups has been selected for serving the UE or hasbeen deselected for serving the UE.

In some aspects, an apparatus for wireless communication may includemeans for identifying a plurality of cells associated with serving a UE,wherein each cell of the plurality of cells has been either selected forserving the UE or deselected for serving the UE; and means fortransmitting an indication of the plurality of cells associated withserving the UE to a wireless communication device, wherein theindication includes information indicating whether each cell of theplurality of cells has been selected for serving the UE or has beendeselected for serving the UE.

In some aspects, an apparatus for wireless communication may includemeans for identifying a plurality of cell groups associated with servinga UE, wherein each cell group of the plurality of cell groups has beeneither selected for serving the UE or deselected for serving the UE; andmeans for transmitting an indication of the plurality of cell groupsassociated with serving the UE to a wireless communication device,wherein the indication includes information indicating whether each cellgroup of the plurality of cell groups has been selected for serving theUE or has been deselected for serving the UE.

In some aspects, a method of wireless communication performed by asecond wireless communication device includes receiving an indication ofa plurality of cells associated with serving a UE from a first wirelesscommunication device, wherein the indication includes informationindicating whether each cell of the plurality of cells has been selectedfor serving the UE or has been deselected for serving the UE; andupdating a list of serving cells of the UE based at least in part on theindication.

In some aspects, a method of wireless communication performed by asecond wireless communication device includes receiving an indication ofa plurality of cell groups associated with serving a UE from a firstwireless communication device, wherein the indication includesinformation indicating whether each cell group of the plurality of cellgroups has been selected for serving the UE or has been deselected forserving the UE; and updating a list of serving cell groups of the UEbased at least in part on the indication.

In some aspects, a second wireless communication device for wirelesscommunication includes a memory and one or more processors operativelycoupled to the memory, the memory and the one or more processorsconfigured to receive an indication of a plurality of cells associatedwith serving a UE from a first wireless communication device, whereinthe indication includes information indicating whether each cell of theplurality of cells has been selected for serving the UE or has beendeselected for serving the UE; and update a list of serving cells of theUE based at least in part on the indication.

In some aspects, a second wireless communication device for wirelesscommunication includes a memory and one or more processors operativelycoupled to the memory, the memory and the one or more processorsconfigured to receive an indication of a plurality of cell groupsassociated with serving a UE from a first wireless communication device,wherein the indication includes information indicating whether each cellgroup of the plurality of cell groups has been selected for serving theUE or has been deselected for serving the UE; and update a list ofserving cell groups of the UE based at least in part on the indication.

In some aspects, a non-transitory computer-readable medium storing a setof instructions for wireless communication includes one or moreinstructions that, when executed by one or more processors of a secondwireless communication device, cause the wireless communication deviceto receive an indication of a plurality of cells associated with servinga UE from a first wireless communication device, wherein the indicationincludes information indicating whether each cell of the plurality ofcells has been selected for serving the UE or has been deselected forserving the UE; and update a list of serving cells of the UE based atleast in part on the indication.

In some aspects, a non-transitory computer-readable medium storing a setof instructions for wireless communication includes one or moreinstructions that, when executed by one or more processors of a secondwireless communication device, cause the wireless communication deviceto receive an indication of a plurality of cell groups associated withserving a UE from a first wireless communication device, wherein theindication includes information indicating whether each cell group ofthe plurality of cell groups has been selected for serving the UE or hasbeen deselected for serving the UE; and update a list of serving cellgroups of the UE based at least in part on the indication.

In some aspects, an apparatus for wireless communication includes meansfor receiving an indication of a plurality of cells associated withserving a UE from a wireless communication device, wherein theindication includes information indicating whether each cell of theplurality of cells has been selected for serving the UE or has beendeselected for serving the UE; and means for updating a list of servingcells of the UE based at least in part on the indication.

In some aspects, an apparatus for wireless communication includes meansfor receiving an indication of a plurality of cell groups associatedwith serving a UE from a wireless communication device, wherein theindication includes information indicating whether each cell group ofthe plurality of cell groups has been selected for serving the UE or hasbeen deselected for serving the UE; and means for updating a list ofserving cell groups of the UE based at least in part on the indication.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, and/or processing system assubstantially described herein with reference to and as illustrated bythe accompanying drawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a block diagram conceptually illustrating an example of awireless communication network, in accordance with various aspects ofthe present disclosure.

FIG. 2 is a block diagram conceptually illustrating an example of a basestation in communication with a UE in a wireless communication network,in accordance with various aspects of the present disclosure.

FIG. 3 is a diagram of an example associated with indication of multipleselected/deselected cells for supporting L1/L2 based mobility, inaccordance with various aspects of the present disclosure.

FIGS. 4 and 5 are diagrams illustrating example processes performed, forexample, by wireless communication devices, in accordance with variousaspects of the present disclosure.

FIG. 6 is a diagram of an example associated with indication of multipleselected/deselected cells for supporting L1/L2 based mobility, inaccordance with various aspects of the present disclosure.

FIGS. 7 and 8 are diagrams illustrating example processes performed, forexample, by wireless communication devices, in accordance with variousaspects of the present disclosure.

FIGS. 9 and 10 are block diagrams of example apparatuses for wirelesscommunication, in accordance with various aspects of the presentdisclosure.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based on theteachings herein one skilled in the art should appreciate that the scopeof the disclosure is intended to cover any aspect of the disclosuredisclosed herein, whether implemented independently of or combined withany other aspect of the disclosure. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition toor other than the various aspects of the disclosure set forth herein. Itshould be understood that any aspect of the disclosure disclosed hereinmay be embodied by one or more elements of a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, and/or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

It should be noted that while aspects may be described herein usingterminology commonly associated with 3G and/or 4G wireless technologies,aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

FIG. 1 is a diagram illustrating a wireless network 100 in which aspectsof the present disclosure may be practiced. The wireless network 100 maybe an LTE network or some other wireless network, such as a 5G or NRnetwork. The wireless network 100 may include a number of BSs 110 (shownas BS 110 a, BS 110 b, BS 110 c, and BS 110 d) and other networkentities. ABS is an entity that communicates with user equipment (UEs)and may also be referred to as a base station, a NR BS, a Node B, a gNB,a 5G node B (NB), an access point, a transmit receive point (TRP),and/or the like. Each BS may provide communication coverage for aparticular geographic area. In 3GPP, the term “cell” can refer to acoverage area of a BS and/or a BS subsystem serving this coverage area,depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a closed subscriber group (CSG)). ABS for a macro cell may bereferred to as a macro BS. ABS for a pico cell may be referred to as apico BS. A BS for a femto cell may be referred to as a femto BS or ahome BS. In the example shown in FIG. 1, a BS 110 a may be a macro BSfor a macro cell 102 a, a BS 110 b may be a pico BS for a pico cell 102b, and a BS 110 c may be a femto BS for a femto cell 102 c. A BS maysupport one or multiple (e.g., three) cells. The terms “eNB”, “basestation”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” maybe used interchangeably herein.

In some aspects, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some aspects, the BSs may be interconnected to one anotherand/or to one or more other BSs or network nodes (not shown) in thewireless network 100 through various types of backhaul interfaces suchas a direct physical connection, a virtual network, and/or the likeusing any suitable transport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (e.g., a BS or a UE) and send a transmission of the data to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that can relay transmissions for other UEs. In the example shown inFIG. 1, a relay station 110 d may communicate with macro BS 110 a and aUE 120 d in order to facilitate communication between BS 110 a and UE120 d. A relay station may also be referred to as a relay BS, a relaybase station, a relay, and/or the like.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/orthe like. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impacts on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relayBSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs may also communicatewith one another, e.g., directly or indirectly via a wireless orwireline backhaul.

UEs 120 (e.g., 120 a, 120 b, 120 c) may be dispersed throughout wirelessnetwork 100, and each UE may be stationary or mobile. A UE may also bereferred to as an access terminal, a terminal, a mobile station, asubscriber unit, a station, and/or the like. A UE may be a cellularphone (e.g., a smart phone), a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, alaptop computer, a cordless phone, a wireless local loop (WLL) station,a tablet, a camera, a gaming device, a netbook, a smartbook, anultrabook, a medical device or equipment, biometric sensors/devices,wearable devices (smart watches, smart clothing, smart glasses, smartwrist bands, smart jewelry (e.g., smart ring, smart bracelet)), anentertainment device (e.g., a music or video device, or a satelliteradio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, and/or the like, that may communicate with abase station, another device (e.g., remote device), or some otherentity. A wireless node may provide, for example, connectivity for or toa network (e.g., a wide area network such as Internet or a cellularnetwork) via a wired or wireless communication link. Some UEs may beconsidered Internet-of-Things (IoT) devices, and/or may be implementedas NB-IoT (narrowband internet of things) devices. Some UEs may beconsidered a Customer Premises Equipment (CPE). UE 120 may be includedinside a housing that houses components of UE 120, such as processorcomponents, memory components, and/or the like.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular radioaccess technology (RAT) and may operate on one or more frequencies. ARAT may also be referred to as a radio technology, an air interface,and/or the like. A frequency may also be referred to as a carrier, afrequency channel, and/or the like. Each frequency may support a singleRAT in a given geographic area in order to avoid interference betweenwireless networks of different RATs. In some cases, NR or 5G RATnetworks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120 a and UE 120e) may communicate directly using one or more sidelink channels (e.g.,without using a base station 110 as an intermediary to communicate withone another). For example, the UEs 120 may communicate usingpeer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (e.g., which mayinclude a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure(V2I) protocol, and/or the like), a mesh network, and/or the like. Inthis case, the UE 120 may perform scheduling operations, resourceselection operations, and/or other operations described elsewhere hereinas being performed by the base station 110.

In some aspects, a wireless communication device of FIG. 1 (e.g., basestation 110, UE 120, network controller 130, and/or the like) mayperform one or more operations associated with indication of multipleselected/deselected cells for supporting L1/L2 based mobility, asdescribed herein. For example, the wireless communication device may,after selecting/deselecting a plurality of cells for serving a UE 120,provide an indication of the plurality of cells, where the indicationincludes information indicating whether each cell of the plurality ofcells has been selected for serving the UE or has been deselected forserving the UE.

As indicated above, FIG. 1 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 1.

FIG. 2 shows a block diagram of a design 200 of base station 110 and UE120, which may be one of the base stations and one of the UEs in FIG. 1.Base station 110 may be equipped with T antennas 234 a through 234 t,and UE 120 may be equipped with R antennas 252 a through 252 r, where ingeneral T≥1 and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCS) for each UE based at least in part on channelquality indicators (CQIs) received from the UE, process (e.g., encodeand modulate) the data for each UE based at least in part on the MCS(s)selected for the UE, and provide data symbols for all UEs. Transmitprocessor 220 may also process system information (e.g., for semi-staticresource partitioning information (SRPI) and/or the like) and controlinformation (e.g., CQI requests, grants, upper layer signaling, and/orthe like) and provide overhead symbols and control symbols. Transmitprocessor 220 may also generate reference symbols for reference signals(e.g., the cell-specific reference signal (CRS)) and synchronizationsignals (e.g., the primary synchronization signal (PSS) and secondarysynchronization signal (SSS)). A transmit (TX) multiple-inputmultiple-output (MIMO) processor 230 may perform spatial processing(e.g., precoding) on the data symbols, the control symbols, the overheadsymbols, and/or the reference symbols, if applicable, and may provide Toutput symbol streams to T modulators (MODs) 232 a through 232 t. Eachmodulator 232 may process a respective output symbol stream (e.g., forOFDM and/or the like) to obtain an output sample stream. Each modulator232 may further process (e.g., convert to analog, amplify, filter, andupconvert) the output sample stream to obtain a downlink signal. Tdownlink signals from modulators 232 a through 232 t may be transmittedvia T antennas 234 a through 234 t, respectively. According to variousaspects described in more detail below, the synchronization signals canbe generated with location encoding to convey additional information.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom base station 110 and/or other base stations and may providereceived signals to demodulators (DEMODs) 254 a through 254 r,respectively. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (e.g., forOFDM and/or the like) to obtain received symbols. A MIMO detector 256may obtain received symbols from all R demodulators 254 a through 254 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (e.g.,demodulate and decode) the detected symbols, provide decoded data for UE120 to a data sink 260, and provide decoded control information andsystem information to a controller/processor 280. A channel processormay determine reference signal received power (RSRP), received signalstrength indicator (RSSI), reference signal received quality (RSRQ),channel quality indicator (CQI), and/or the like. In some aspects, oneor more components of UE 120 may be included in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) fromcontroller/processor 280. Transmit processor 264 may also generatereference symbols for one or more reference signals. The symbols fromtransmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by modulators 254 a through 254 r (e.g.,for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to basestation 110. At base station 110, the uplink signals from UE 120 andother UEs may be received by antennas 234, processed by demodulators232, detected by a MIMO detector 236 if applicable, and furtherprocessed by a receive processor 238 to obtain decoded data and controlinformation sent by UE 120. Receive processor 238 may provide thedecoded data to a data sink 239 and the decoded control information tocontroller/processor 240. Base station 110 may include communicationunit 244 and communicate to network controller 130 via communicationunit 244. Network controller 130 may include communication unit 294,controller/processor 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform one ormore techniques associated with multiple selected/deselected cells forL1/L2 based mobility, as described in more detail elsewhere herein. Forexample, controller/processor 240 of base station 110,controller/processor 280 of UE 120, and/or any other component(s) ofFIG. 2 may perform or direct operations of, for example, process 400 ofFIG. 4, process 600 of FIG. 6, and/or other processes as describedherein. Memories 242 and 282 may store data and program codes for basestation 110 and UE 120, respectively. In some aspects, memory 242 and/ormemory 282 may comprise a non-transitory computer-readable mediumstoring one or more instructions for wireless communication. Forexample, the one or more instructions, when executed by one or moreprocessors of the base station 110 and/or the UE 120, may perform ordirect operations of, for example, process 400 of FIG. 4, process 600 ofFIG. 6, and/or other processes as described herein. A scheduler 246 mayschedule UEs for data transmission on the downlink and/or uplink.

In some aspects, a first wireless communication device (e.g., a UE 120,a base station 110) may include means for identifying a plurality ofcells associated with serving a UE 120, wherein each cell of theplurality of cells has been either selected for serving the UE 120 ordeselected for serving the UE 120; means for transmitting an indicationof the plurality of cells associated with serving the UE 120 to a secondwireless communication device (e.g., a base station 110, a UE 120),wherein the indication includes information indicating whether each cellof the plurality of cells has been selected for serving the UE 120 orhas been deselected for serving the UE 120; and/or the like. In someaspects, such means may include one or more components of UE 120described in connection with FIG. 2, such as controller/processor 280,transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252,DEMOD 254, MIMO detector 256, receive processor 258, and/or the like. Insome aspects, such means may include one or more components of basestation 110 described in connection with FIG. 2, such as antenna 234,DEMOD 232, MIMO detector 236, receive processor 238,controller/processor 240, transmit processor 220, TX MIMO processor 230,MOD 232, antenna 234, and/or the like.

In some aspects, a first wireless communication device (e.g., a UE 120,a base station 110) may include means for identifying a plurality ofcell groups associated with serving a UE 120, wherein each cell group ofthe plurality of cell groups has been either selected for serving the UE120 or deselected for serving the UE 120; means for transmitting anindication of the plurality of cell groups associated with serving theUE 120 to a second wireless communication device (e.g., a base station110, a UE 120), wherein the indication includes information indicatingwhether each cell group of the plurality of cell groups has beenselected for serving the UE 120 or has been deselected for serving theUE 120; and/or the like. In some aspects, such means may include one ormore components of UE 120 described in connection with FIG. 2, such ascontroller/processor 280, transmit processor 264, TX MIMO processor 266,MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor258, and/or the like. In some aspects, such means may include one ormore components of base station 110 described in connection with FIG. 2,such as antenna 234, DEMOD 232, MIMO detector 236, receive processor238, controller/processor 240, transmit processor 220, TX MIMO processor230, MOD 232, antenna 234, and/or the like.

In some aspects, a second wireless communication device (e.g., a UE 120,a base station 110) may include means for receiving an indication of aplurality of cells associated with serving a UE 120 from a firstwireless communication device (e.g., a base station 110, a UE 120),wherein the indication includes information indicating whether each cellof the plurality of cells has been selected for serving the UE 120 orhas been deselected for serving the UE 120; means for updating a list ofserving cells of the UE 120 based at least in part on the indication;and/or the like. In some aspects, such means may include one or morecomponents of UE 120 described in connection with FIG. 2, such ascontroller/processor 280, transmit processor 264, TX MIMO processor 266,MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor258, and/or the like. In some aspects, such means may include one ormore components of base station 110 described in connection with FIG. 2,such as antenna 234, DEMOD 232, MIMO detector 236, receive processor238, controller/processor 240, transmit processor 220, TX MIMO processor230, MOD 232, antenna 234, and/or the like.

In some aspects, a second wireless communication device (e.g., a UE 120,a base station 110) may include means for receiving an indication of aplurality of cell groups associated with serving a UE 120 from a firstwireless communication device (e.g., a base station 110, a UE 120),wherein the indication includes information indicating whether each cellgroup of the plurality of cell groups has been selected for serving theUE 120 or has been deselected for serving the UE 120; means for updatinga list of serving cell groups of the UE 120 based at least in part onthe indication; and/or the like. In some aspects, such means may includeone or more components of UE 120 described in connection with FIG. 2,such as controller/processor 280, transmit processor 264, TX MIMOprocessor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256,receive processor 258, and/or the like. In some aspects, such means mayinclude one or more components of base station 110 described inconnection with FIG. 2, such as antenna 234, DEMOD 232, MIMO detector236, receive processor 238, controller/processor 240, transmit processor220, TX MIMO processor 230, MOD 232, antenna 234, and/or the like.

As indicated above, FIG. 2 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 2.

In some wireless communication systems, such as an NR system, a set ofmechanisms by which UEs and base stations establish directional links(e.g., using high-dimensional phased arrays) may be useful (e.g., tobenefit from beamforming gain and/or to maintain acceptablecommunication quality). Such directional links, however, require finealignment of transmit and receive beams. This alignment may be achievedthrough a set of operations referred to as beam management.

Further, a wireless communication system may support multi-beamoperation in a relatively high carrier frequency (e.g., within FrequencyRange 2 (FR2)). In such cases, the higher carrier frequency makespropagation conditions harsher than at a comparatively lower carrierfrequency. For example, signals propagating in a millimeter wave bandmay suffer from increased pathloss and severe channel intermittency,and/or may be blocked by objects commonly present in an environment ofthe UE (e.g., a building, a tree, a body of a user, and/or the like), ascompared to a sub-6 gigahertz (GHz) band. As a result, beam managementis of particular importance for multi-beam operation in a relativelyhigh carrier frequency.

One possible enhancement for multi-beam operation in a higher carrierfrequency is facilitation of efficient (e.g., low latency and lowoverhead) beam management to support higher L1/L2-centric inter-cellmobility. L1/L2-centric inter-cell mobility may be used when, forexample, a multi-beam UE operating in FR2 moves from one or more firstcells to one or more second cells. Notably, such cell switching may beused regularly due to operation in FR2. Numerous operation modes ofL1/L2-centric inter-cell mobility are possible. One goal forL1/L2-centric inter-cell mobility is to enable a UE to perform a cellswitch via a lower layer (e.g., L1 and/or L2) rather than a higherlayer, which increases efficiency of the cell switch (e.g., by reducinglatency and overhead).

In an L1/L2-centric inter-cell mobility scenario with multi-beamoperation, a wireless communication device (e.g., a UE, a base station,and/or the like) may need to simultaneously select one or more cellsand/or deselect one or more cells for serving the UE. For example, thewireless communication device may need to select/deselect from a pool of32 candidate cells for a given physical cell site (e.g., where each ofthe 32 candidate cells covers a different frequency). A technique forindicating the multiple selected/deselected cells may help to supportL1/L2-centric inter-cell mobility.

Some aspects described herein provide techniques and apparatuses forindication of multiple selected/deselected cells for supporting L1/L2based mobility. In some aspects, indication of the multiple cells in themanner described here may enable cell switching via a lower layer (e.g.,L1 and/or L2), thereby increasing efficiency (e.g., by reducing latencyand/or overhead) of beam management in support of L1/L2-centricinter-cell mobility.

FIG. 3 is a diagram illustrating an example associated with indicationof multiple selected/deselected cells for supporting L1/L2 basedmobility, in accordance with various aspects of the present disclosure.Notably, in the example shown in FIG. 3, the wireless communicationdevice indicating the multiple selected/deselected cells is a basestation (e.g., a base station 110) indicating multipleselected/deselected cells to a UE (e.g., a UE 120). However, in otherexamples the wireless communication device indicating the multipleselected/deselected cells may be another type of wireless communicationdevice, such as a UE (e.g., a UE 120) indicating the multipleselected/deselected cells to a base station (e.g., a base station 110).

As shown by reference 305, the wireless communication device mayidentify a plurality of cells associated with serving the UE. Forexample, when the wireless communication device is the UE, the UE mayuse receive processor 258, controller/processor 280, and/or the like, toidentify a plurality of cells associated with serving the UE. As anotherexample, when the wireless communication device is a base station (e.g.,a base station 110), the base station may use processor 220,controller/processor 240, and/or the like, to identify a plurality ofcells associated with serving the UE. Here, the plurality of cellsassociated with the serving the UE includes a plurality of cells, eachof which has been either selected for serving the UE or deselected forserving the UE.

In some aspects, the wireless communication device may select ordeselect a given cell of the plurality of cells for serving the UE basedon a reference signal associated with the cell. For example, thewireless communication device may select or deselect a given cell of theplurality of cells based on a reference signal received power (RSRP)associated with the given cell (e.g., an RSRP per reportedsynchronization signal block (SSB) identifier, an RSRP per reported SSBidentifier per physical cell identifier (PCI), and/or the like).

In some aspects, the manner in which a given cell of the plurality ofcells is selected or deselected may depend on an operation mode ofL1/L2-centric inter-cell mobility. A first example of an operation modemay include a mode of operation in which each serving cell has onephysical cell identifier (PCI) and can have multiple physical cell sites(e.g., remote radio headers (RRH)). Here, each RRH may transmit adifferent set of synchronization signal block (SSB) identifiers, butwith a same PCI for the serving cell. In this operation mode, downlinkcontrol information (DCI) or a medium access control control element(MAC-CE) can indicate one or more RRHs or corresponding SSBs selected toserve the UE based at least in part on a RSRP per reported SSBidentifier. A second example of an operation mode includes a mode ofoperation in which each serving cell can be configured with multiplePCIs, and each RRH of the serving cell can use one PCI configured forthe serving cell and can transmit a full set of SSB identifiers. Here,DCI or a MAC-CE can indicate one or more RRHs or one or morecorresponding PCIs and/or SSBs selected to serve the UE based at leastin part on a RSRP per reported SSB identifier per reported PCI. A thirdexample of an operation mode may include a mode of operation mode inwhich each serving cell has one PCI. Here, DCI or a MAC-CE can indicateone or more serving cells or corresponding serving cell identifiersselected to serve the UE based on a RSRP per reported SSB identifier perreported PCI. Notably, while SSBs are described in the above examples,an SSB can be another type of cell-defining reference signal (e.g., achannel state information reference signal (CSI-RS), positioningreference signal (PRS), and/or the like).

In some aspects, where the selection of cells for serving a UE is doneby a network entity or a base station, a UE may measure a referencesignal (e.g., the UE may measure a RSRP) and report the measurements orother details about the measurement to the network. Based on thesereports, the network entity or base station may select or deselect cellsfor serving the UE.

As shown by reference 310, the wireless communication device maytransmit an indication of the plurality of cells associated with servingthe UE to another wireless communication device. For example, when thewireless communication device is the UE, the UE may use transmitprocessor 264, controller/processor 280, and/or the like, to transmit anindication of the plurality of cells associated with serving the UE to abase station. As another example, when the wireless communication deviceis the base station, the base station may use transmit processor 220,controller/processor 240, and/or the like, to transmit an indication ofthe plurality of cells associated with serving the UE to the UE. Here,the indication includes information indicating, for each cell of theplurality of cells, whether the cell has been selected for serving theUE or has been deselected for serving the UE. In some aspects, thewireless communication device may transmit the indication via, forexample, radio resource control (RRC) signaling, a MAC-CE, DCI, and/orthe like.

In some aspects, for a given cell of the plurality of cells, theindication may include information that identifies the given cell. Insome aspects, the information that identifies the given cell mayinclude, for example, a serving cell identifier or a PCI.

In some aspects, for a given cell of the plurality of cells, theindication may include a cell group identifier associated with a cellgroup of the given cell. In some aspects, the cell group identified bythe cell group identifier may be a primary cell group or a secondarycell group. In some aspects, a primary cell group may include a group ofprimary cells, where a primary cell is a cell operating on a primaryfrequency associated with performing operations such as initialconnection establishment, a connection re-establishment procedure,and/or the like. In some aspects, a secondary cell group may include agroup of secondary cells, where secondary cell is a cell operating on asecondary frequency that may be used, for example, to provide additionalradio resources.

In some aspects, for a given cell of the plurality of cells, theindication may include a cell type indicator associated with the givencell. For example, in some aspects, the cell type indicator mayindicate, for example, whether the given cell is a primary cell, asecondary cell, or a primary secondary cell (e.g., a secondary cellconfigured with a physical uplink control channel (PUCCH) resource toenable transmission of hybrid automatic repeat request (HARQ) feedback,channel state information (CSI), and/or the like, associated with one ormore secondary cells). As another example, in some aspects, the celltype indicator may indicate whether the given cell is a PUCCH cell or anon-PUCCH cell. A PUCCH cell may be a cell that allows PUCCHcommunication on the cell, while a non-PUCCH cell may be a cell thatdoes not allow PUCCH communication on the cell. In some aspects, controland/or uplink may only be used on one cell (e.g., a cell operating in alower frequency range, such as a sub-6 GHz frequency) while other cellsmay be downlink-only cells (e.g., in order to support high data rates).

As described above, each cell of the plurality of cells has beenselected for serving the UE or has been deselected for serving the UE.In some aspects, when a given cell of the plurality of cells has beenselected for serving the UE, the indication may include informationindicating that the given cell is to be added to a list of cells forserving the UE (e.g., when a list of cells for serving the UE ismaintained by the wireless communication device receiving theindication). Similarly, in some aspects, when a given cell of theplurality of cells has been deselected for serving the UE, theindication may include information indicating that the given cell is tobe removed from a list of cells for serving the UE, if the given cell isin the list of cells for serving the UE. In some aspects, a given cellthat is not selected for serving the UE may be considered as having beendeselected even if it was not previously selected for serving the UE. Insome aspects, a given cell that is not selected for serving the UE butwas previously selected for serving the UE may be indicated as havingbeen deselected.

In some aspects, the information indicating whether each cell of theplurality of cells has been selected for serving the UE or has beendeselected for serving the UE includes a list of cells selected forserving the UE. That is, in some aspects, the indication may include afull list of cells for serving the UE. Here, inclusion of a given cellin the indication serves to indicate that the given cell has beenselected for serving the UE, while exclusion of a given cell from theindication serves to indicate that the given cell has been deselectedfor serving the UE, or has not been selected for serving the UE.

In some aspects, as shown by reference 315, another wirelesscommunication device may receive the indication and may update a list ofserving cells of the UE based at least in part on the indication. Forexample, when the other wireless communication device is the UE, the UEmay use receive processor 258, controller/processor 280, and/or thelike, to receive the indication and update a list of serving cells ofthe UE based at least in part on the indication. As another example,when the wireless communication device is the base station, the basestation may use receive processor 238, controller/processor 240, and/orthe like, to receive the indication and update the list of serving cellsof the UE based at least in part on the indication.

As indicated above, FIG. 3 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 3.

FIG. 4 is a diagram illustrating an example process 400 performed, forexample, by a first wireless communication device, in accordance withvarious aspects of the present disclosure. Example process 400 is anexample where the first wireless communication device (e.g., UE 120,base station 110, and/or the like) performs operations associated withmultiple selected/deselected cells for L1/L2 based mobility.

As shown in FIG. 4, in some aspects, process 400 may include identifyinga plurality of cells associated with serving a UE, wherein each cell ofthe plurality of cells has been either selected for serving the UE ordeselected for serving the UE (block 410). For example, the firstwireless communication device (e.g., using receive processor 258,transmit processor 264, controller/processor 280, memory 282, and/or thelike, when the first wireless communication device is a UE 120; usingtransmit processor 220, receive processor 238, controller/processor 240,memory 242, and/or the like, when the first wireless communicationdevice is a base station 110; using identification component 908) mayidentify a plurality of cells associated with serving a UE (e.g., UE120), as described above. In some aspects, each cell of the plurality ofcells has been either selected for serving the UE or deselected forserving the UE. In some aspects, the first wireless communication devicemay identify the plurality of cells associated with serving the UE in amanner similar to that described above in association with reference 305of FIG. 3.

As further shown in FIG. 4, in some aspects, process 400 may includetransmitting an indication of the plurality of cells associated withserving the UE to a second wireless communication device, wherein theindication includes information indicating whether each cell of theplurality of cells has been selected for serving the UE or has beendeselected for serving the UE (block 420). For example, the firstwireless communication device (e.g., using transmit processor 264,controller/processor 280, memory 282, and/or the like, when the firstwireless communication device is a UE 120; using transmit processor 220,controller/processor 240, memory 242, and/or the like, when the firstwireless communication device is a base station 110; transmissioncomponent 904) may transmit an indication of the plurality of cellsassociated with serving the UE to a second wireless communication device(e.g., the UE 120, a base station, or the like), as described above. Insome aspects, the indication includes information indicating whethereach cell of the plurality of cells has been selected for serving the UEor has been deselected for serving the UE. In some aspects, the firstwireless communication device may transmit the indication of theplurality of cells associated with serving the UE in a manner similar tothat described above in association with reference 310 of FIG. 3.

Process 400 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, for a given cell of the plurality of cells, theindication includes information that identifies the given cell.

In a second aspect, alone or in combination with the first aspect, theinformation that identifies the given cell includes at least one of aserving cell identifier or a physical cell identifier.

In a third aspect, alone or in combination with one or more of the firstand second aspects, for a given cell of the plurality of cells, theindication includes a cell group identifier associated with a cell groupof the given cell.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the cell group is a primary cell group or asecondary cell group.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, for a given cell of the plurality of cells, theindication includes a cell type indicator associated with the givencell.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the cell type indicator indicates whether thegiven cell is a primary cell, a secondary cell, or a primary secondarycell.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the cell type indicator indicates whetherthe given cell is a physical uplink control channel (PUCCH) cell or anon-PUCCH cell.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, when a given cell of the plurality ofcells has been selected for serving the UE, the indication includesinformation indicating that the given cell is to be added to a list ofcells for serving the UE.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, when a given cell of the plurality of cells hasbeen deselected for serving the UE, the indication includes informationindicating that the given cell is to be removed from a list of cells forserving the UE.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, the information indicating whether each cell ofthe plurality of cells has been selected for serving the UE or has beendeselected for serving the UE includes a list of cells selected forserving the UE.

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, the indication is transmitted via RRCsignaling.

In a twelfth aspect, alone or in combination with one or more of thefirst through eleventh aspects, the indication is transmitted via aMAC-CE element.

In a thirteenth aspect, alone or in combination with one or more of thefirst through twelfth aspects, the indication is transmitted via DCI.

In a fourteenth aspect, alone or in combination with one or more of thefirst through thirteenth aspects, the first wireless communicationdevice is a base station and the second wireless communication device isthe UE.

In a fifteenth aspect, alone or in combination with one or more of thefirst through thirteenth aspects, the first wireless communicationdevice is the UE and the second wireless communication device is a basestation.

Although FIG. 4 shows example blocks of process 400, in some aspects,process 400 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 4.Additionally, or alternatively, two or more of the blocks of process 400may be performed in parallel.

FIG. 5 is a diagram illustrating an example process 500 performed, forexample, by a second wireless communication device, in accordance withvarious aspects of the present disclosure. Example process 500 is anexample where the second wireless communication device (e.g., UE 120,base station 110) performs operations associated with multipleselected/deselected cells for L1/L2 based mobility.

As shown in FIG. 5, in some aspects, process 500 may include receivingan indication of a plurality of cells associated with serving a UE froma first wireless communication device, wherein the indication includesinformation indicating whether each cell of the plurality of cells hasbeen selected for serving the UE or has been deselected for serving theUE (block 510). For example, the second wireless communication device(e.g., using receive processor 258, controller/processor 280, memory282, and/or the like, when the second wireless communication device is aUE 120; using receive processor 238, controller/processor 240, memory242, and/or the like, when the second wireless communication device is abase station 110; using reception component 1002) may receive anindication of a plurality of cells associated with serving a UE from afirst wireless communication device (e.g., a base station 110, a UE 120,or the like), wherein the indication includes information indicatingwhether each cell of the plurality of cells has been selected forserving the UE or has been deselected for serving the UE, as describedabove. In some aspects, the second wireless communication device mayreceive the indication in a manner similar to that described above inassociation with reference 315 of FIG. 3.

As further shown in FIG. 5, in some aspects, process 500 may includeupdating a list of serving cells of the UE based at least in part on theindication (block 520). For example, the second wireless communicationdevice (e.g., using receive processor 258, transmit processor 264,controller/processor 280, memory 282, and/or the like, when the secondwireless communication device is a UE 120; using transmit processor 220,receive processor 238, controller/processor 240, memory 242, and/or thelike, when the second wireless communication device is a base station110; using update component 1008) may update a list of serving cells ofthe UE based at least in part on the indication, as described above. Insome aspects, the second wireless communication device may update thelist of serving cells of the UE based at least in part on theindication, in a manner similar to that described above in associationwith reference 315 of FIG. 3.

Process 500 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, for a given cell of the plurality of cells, theindication includes information that identifies the given cell. In asecond aspect, in combination with the first aspect, the informationthat identifies the given cell includes at least one of a serving cellidentifier or a physical cell identifier.

In a third aspect, alone or in combination with one or more of the firstand second aspects, for a given cell of the plurality of cells, theindication includes a cell group identifier associated with a cell groupof the given cell. In a fourth aspect, in combination with the thirdaspect, the cell group is a primary cell group or a secondary cellgroup.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, for a given cell of the plurality of cells, theindication includes a cell type indicator associated with the givencell. In a sixth aspect, in combination with the fifth aspect, the celltype indicator indicates whether the given cell is a primary cell, asecondary cell, or a primary secondary cell. In a seventh aspect, aloneor in combination with one or more of the fifth and sixth aspects, thecell type indicator indicates whether the given cell is a PUCCH cell ora non-PUCCH cell.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, when a given cell of the plurality ofcells has been selected for serving the UE, the indication includesinformation indicating that the given cell is to be added to a list ofcells for serving the UE.

In a ninth aspect, alone or in combination with one or more of the firstthrough eight aspects, when a given cell of the plurality of cells hasbeen deselected for serving the UE, the indication includes informationindicating that the given cell is to be removed from a list of cells forserving the UE.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, the information indicating whether each cell ofthe plurality of cells has been selected for serving the UE or has beendeselected for serving the UE includes a list of cells selected forserving the UE.

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, the indication is transmitted via radioresource control signaling. In a twelfth aspect, alone or in combinationwith one or more of the first through eleventh aspects, the indicationis transmitted via a medium access control control element. In athirteenth aspect, alone or in combination with one or more of the firstthrough twelfth aspects, the indication is transmitted via downlinkcontrol information.

In a fourteenth aspect, alone or in combination with one or more of thefirst through thirteenth aspects, the second wireless communicationdevice is a base station and the first wireless communication device isthe UE. In a fifteenth aspect, alone or in combination with one or moreof the first through thirteenth aspects, the second wirelesscommunication device is the UE and the first wireless communicationdevice is a base station.

Although FIG. 5 shows example blocks of process 500, in some aspects,process 500 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 5.Additionally, or alternatively, two or more of the blocks of process 500may be performed in parallel.

FIG. 6 is a diagram illustrating an example associated with indicationof multiple selected/deselected cells for supporting L1/L2 basedmobility, in accordance with various aspects of the present disclosure.Notably, in the example shown in FIG. 6, the wireless communicationdevice indicating the multiple selected/deselected cells is a basestation (e.g., a base station 110) indicating multipleselected/deselected cells to a UE (e.g., a UE 120). However, in otherexamples the wireless communication device indicating the multipleselected/deselected cells may be another type of wireless communicationdevice, such as a UE (e.g., a UE 120) indicating the multipleselected/deselected cells to a base station (e.g., a base station 110).

As shown by reference 605, the wireless communication device mayidentify a plurality of cell groups associated with serving the UE. Forexample, when the wireless communication device is the UE, the UE mayuse receive processor 258, controller/processor 280, and/or the like, toidentify a plurality of cell groups associated with serving the UE. Asanother example, when the wireless communication device is a basestation (e.g., a base station 110), the base station may use processor220, controller/processor 240, and/or the like, to identify a pluralityof cell groups associated with serving the UE. Here, the plurality ofcell groups associated with the serving the UE includes a plurality ofcell groups, each of which has been either selected for serving the UEor deselected for serving the UE.

In some aspects, the wireless communication device may select ordeselect a given cell group of the plurality of cell groups for servingthe UE based on a reference signal associated with the cell group. Forexample, the wireless communication device may select or deselect agiven cell group of the plurality of cell groups based on a referencesignal received power (RSRP) associated with the given cell group. Insome aspects, the manner in which a given cell group of the plurality ofcell groups is selected or deselected may depend on an operation mode ofL1/L2-centric inter-cell mobility, examples of which are provided above.In some aspects, where the selection of cells for serving a UE is doneby a network entity or a base station, a UE may measure a referencesignal (e.g., the UE may measure a RSRP) and report the measurements orother details about the measurement to the network. Based on thesereports, the network entity or base station may select or deselect cellsfor serving the UE.

As shown by reference 610, the wireless communication device maytransmit an indication of the plurality of cell groups associated withserving the UE to another wireless communication device. For example,when the wireless communication device is the UE, the UE may usetransmit processor 264, controller/processor 280, and/or the like, totransmit an indication of the plurality of cell groups associated withserving the UE to the base station. As another example, when thewireless communication device is the base station, the base station mayuse transmit processor 220, controller/processor 240, and/or the like,to transmit an indication of the plurality of cell groups associatedwith serving the UE to the UE. Here, the indication includes informationindicating whether each cell group of the plurality of cell groups hasbeen selected for serving the UE or has been deselected for serving theUE. In some aspects, the wireless communication device may transmit theindication via, for example, RRC signaling, a MAC-CE, DCI, and/or thelike.

In some aspects, for a given cell group of the plurality of cell groups,the indication includes a cell group identifier associated with thegiven cell group. In some aspects, the given cell group may be a primarycell group or a secondary cell group.

As described above, each cell group of the plurality of cell groups hasbeen selected for serving the UE or has been deselected for serving theUE. In some aspects, when a given cell group of the plurality of cellgroups has been selected for serving the UE, the indication may includeinformation indicating that the given cell group is to be added to alist of cell groups for serving the UE (e.g., when a list of cell groupsfor serving the UE is maintained by the wireless communication devicereceiving the indication). Similarly, in some aspects, when a given cellgroup of the plurality of cell groups has been deselected for servingthe UE, the indication may include information indicating that the givencell group is to be removed from a list of cell groups for serving theUE, if the given cell group is in the list of cell groups for servingthe UE. In some aspects, a given cell group that is not selected forserving the UE may be considered as having been deselected even if itwas not previously selected for serving the UE. In some aspects, a givencell group that is not selected for serving the UE but was previouslyselected for serving the UE may be indicated as having been deselected.

In some aspects, the information indicating whether each cell group ofthe plurality of cell groups has been selected for serving the UE or hasbeen deselected for serving the UE includes a list of cell groupsselected for serving the UE. That is, in some aspects, the indicationmay include a full list of cell groups for serving the UE. Here,inclusion of a given cell group in the indication serves to indicatethat the given cell group has been selected for serving the UE, whileexclusion of a given cell group from the indication serves to indicatethat the given cell group has been deselected for serving the UE, or hasnot been selected for serving the UE.

In some aspects, as shown by reference 615, another wirelesscommunication device may receive the indication and may update a list ofserving cell groups of the UE based at least in part on the indication.For example, when the other wireless communication device is the UE, theUE may use receive processor 258, controller/processor 280, and/or thelike, to receive the indication and update a list of serving cell groupsof the UE based at least in part on the indication. As another example,when the wireless communication device is the base station, the basestation may use receive processor 238, controller/processor 240, and/orthe like, to receive the indication and update the list of serving cellgroups of the UE based at least in part on the indication.

As indicated above, FIG. 6 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 6.

FIG. 7 is a diagram illustrating an example process 700 performed, forexample, by a first wireless communication device, in accordance withvarious aspects of the present disclosure. Example process 700 is anexample where the wireless first communication device (e.g., UE 120,base station 110, and/or the like) performs operations associated withmultiple selected/deselected cells for L1/L2 based mobility.

As shown in FIG. 7, in some aspects, process 700 may include identifyinga plurality of cell groups associated with serving a UE, wherein eachcell group of the plurality of cell groups has been either selected forserving the UE or deselected for serving the UE (block 710). Forexample, the first wireless communication device (e.g., using receiveprocessor 258, transmit processor 264, controller/processor 280, memory282, and/or the like, when the first wireless communication device is aUE 120; using transmit processor 220, receive processor 238,controller/processor 240, memory 242, and/or the like, when the firstwireless communication device is a base station 110; usingidentification component 908) may identify a plurality of cell groupsassociated with serving a UE (e.g., UE 120), as described above. In someaspects, each cell group of the plurality of cell groups has been eitherselected for serving the UE or deselected for serving the UE. In someaspects, the first wireless communication device may identify theplurality of cell groups associated with serving the UE in a mannersimilar to that described above in association with reference 605 ofFIG. 6.

As further shown in FIG. 7, in some aspects, process 700 may includetransmitting an indication of the plurality of cell groups associatedwith serving the UE to a second wireless communication device, whereinthe indication includes information indicating whether each cell groupof the plurality of cell groups has been selected for serving the UE orhas been deselected for serving the UE (block 720). For example, thefirst wireless communication device (e.g., using transmit processor 264,controller/processor 280, memory 282, and/or the like, when the wirelesscommunication device is a UE 120; using transmit processor 220,controller/processor 240, memory 242, and/or the like, when the firstwireless communication device is a base station 110; using transmissioncomponent 904) may transmit an indication of the plurality of cellgroups associated with serving the UE to a second wireless communicationdevice (e.g., the UE 120, a base station 110, or the like), as describedabove. In some aspects, the indication includes information indicatingwhether each cell group of the plurality of cell groups has beenselected for serving the UE or has been deselected for serving the UE.In some aspects, the first wireless communication device may transmitthe indication of the plurality of cell groups associated with servingthe UE in a manner similar to that described above in association withreference 610 of FIG. 6.

Process 700 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, for a given cell group of the plurality of cellgroups, the indication includes a cell group identifier associated withthe given cell group. In a second aspect, alone or in combination withthe first aspect, the given cell group is a primary cell group or asecondary cell group.

In a third aspect, alone or in combination with one or more of the firstand second aspects, when a given cell group of the plurality of cellgroups has been selected for serving the UE, the indication includesinformation indicating that the given cell group is to be added to alist of cell groups for serving the UE.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, when a given cell group of the plurality ofcell groups has been deselected for serving the UE, the indicationincludes information indicating that the given cell group is to beremoved from a list of cell groups for serving the UE.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the information indicating whether each cellgroup of the plurality of cell groups has been selected for serving theUE or has been deselected for serving the UE includes a list of cellgroups selected for serving the UE.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the indication is transmitted via RRC signaling.In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the indication is transmitted via a MAC-CE.In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the indication is transmitted via DCI.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the first wireless communication device isa base station and the second wireless communication device is the UE.In an eighth aspect, alone or in combination with one or more of thefirst through sixth aspects, the first wireless communication device isthe UE and the second wireless communication device is a base station.

Although FIG. 7 shows example blocks of process 700, in some aspects,process 700 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 7.Additionally, or alternatively, two or more of the blocks of process 700may be performed in parallel.

FIG. 8 is a diagram illustrating an example process 800 performed, forexample, by a second wireless communication device, in accordance withvarious aspects of the present disclosure. Example process 800 is anexample where the second wireless communication device (e.g., UE 120,base station 110) performs operations associated with multipleselected/deselected cells for L1/L2 based mobility.

As shown in FIG. 8, in some aspects, process 800 may include receivingan indication of a plurality of cell groups associated with serving a UEfrom a first wireless communication device, wherein the indicationincludes information indicating whether each cell group of the pluralityof cell groups has been selected for serving the UE or has beendeselected for serving the UE (block 810). For example, the secondwireless communication device (e.g., using receive processor 258,controller/processor 280, memory 282, and/or the like, when the secondwireless communication device is a UE 120; using receive processor 238,controller/processor 240, memory 242, and/or the like, when the secondwireless communication device is a base station 110; using receptioncomponent 1002) may receive an indication of a plurality of cell groupsassociated with serving a UE from a first wireless communication device(e.g., a base station 110, the UE 120, or the like), wherein theindication includes information indicating whether each cell group ofthe plurality of cell groups has been selected for serving the UE or hasbeen deselected for serving the UE, as described above. In some aspects,the second wireless communication device may receive the indication in amanner similar to that described above in association with reference 615of FIG. 6.

As further shown in FIG. 8, in some aspects, process 800 may includeupdating a list of serving cell groups of the UE based at least in parton the indication (block 820). For example, the second wirelesscommunication device (e.g., using receive processor 258, transmitprocessor 264, controller/processor 280, memory 282, and/or the like,when the second wireless communication device is a UE 120; usingtransmit processor 220, receive processor 238, controller/processor 240,memory 242, and/or the like, when the second wireless communicationdevice is a base station 110; using update component 1008) may update alist of serving cell groups of the UE based at least in part on theindication, as described above. In some aspects, the second wirelesscommunication device may update the list of serving cell groups of theUE based at least in part on the indication, in a manner similar to thatdescribed above in association with reference 615 of FIG. 6.

Process 800 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, for a given cell group of the plurality of cellgroups, the indication includes a cell group identifier associated withthe given cell group. In a second aspect, in combination with the firstaspect, the given cell group is a primary cell group or a secondary cellgroup.

In a third aspect, alone or in combination with one or more of the firstand second aspects, when a given cell group of the plurality of cellgroups has been selected for serving the UE, the indication includesinformation indicating that the given cell group is to be added to alist of cell groups for serving the UE.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, when a given cell group of the plurality ofcell groups has been deselected for serving the UE, the indicationincludes information indicating that the given cell group is to beremoved from a list of cell groups for serving the UE.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the information indicating whether each cellgroup of the plurality of cell groups has been selected for serving theUE or has been deselected for serving the UE includes a list of cellgroups selected for serving the UE.

In a sixth aspect, alone or in combination with one or more of the firstthrough seventh aspects, the indication is transmitted via radioresource control signaling. In a seventh aspect, alone or in combinationwith one or more of the first through sixth aspects, the indication istransmitted via a medium access control control element. In an eighthaspect, alone or in combination with one or more of the first throughseventh aspects, the indication is transmitted via downlink controlinformation.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the first wireless communication device is abase station and the second wireless communication device is the UE. Ina tenth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the first wireless communication device is theUE and the second wireless communication device is a base station.

Although FIG. 8 shows example blocks of process 800, in some aspects,process 800 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 8.Additionally, or alternatively, two or more of the blocks of process 800may be performed in parallel.

FIG. 9 is a block diagram of an example apparatus 900 for wirelesscommunication. The apparatus 900 may be a wireless communication device(e.g., a base station or a UE), or a wireless communication device mayinclude the apparatus 900. In some aspects, the apparatus 900 includes areception component 902 and a transmission component 904, which may bein communication with one another (for example, via one or more busesand/or one or more other components). As shown, the apparatus 900 maycommunicate with another apparatus 906 (such as a UE, a base station, oranother wireless communication device) using the reception component 902and the transmission component 904. As further shown, the apparatus 900may include an identification component 908, among other examples.

In some aspects, the apparatus 900 may be configured to perform one ormore operations described herein in connection with FIGS. 3 and 6.Additionally or alternatively, the apparatus 900 may be configured toperform one or more processes described herein, such as process 400 ofFIG. 4, process 700 of FIG. 7, or a combination thereof. In someaspects, the apparatus 900 and/or one or more components shown in FIG. 9may include one or more components of the base station or the UEwireless described above in connection with FIG. 2. Additionally, oralternatively, one or more components shown in FIG. 9 may be implementedwithin one or more components described above in connection with FIG. 2.Additionally or alternatively, one or more components of the set ofcomponents may be implemented at least in part as software stored in amemory. For example, a component (or a portion of a component) may beimplemented as instructions or code stored in a non-transitorycomputer-readable medium and executable by a controller or a processorto perform the functions or operations of the component.

The reception component 902 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 906. The reception component 902may provide received communications to one or more other components ofthe apparatus 900. In some aspects, the reception component 902 mayperform signal processing on the received communications (such asfiltering, amplification, demodulation, analog-to-digital conversion,demultiplexing, deinterleaving, de-mapping, equalization, interferencecancellation, or decoding, among other examples), and may provide theprocessed signals to the one or more other components of the apparatus906. In some aspects, the reception component 902 may include one ormore antennas, a demodulator, a MIMO detector, a receive processor, acontroller/processor, a memory, or a combination thereof, of thewireless communication device described above in connection with FIG. 2.

The transmission component 904 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 906. In some aspects, one or moreother components of the apparatus 906 may generate communications andmay provide the generated communications to the transmission component904 for transmission to the apparatus 906. In some aspects, thetransmission component 904 may perform signal processing on thegenerated communications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 906. In some aspects, the transmission component 904may include one or more antennas, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the wireless communication device describedabove in connection with FIG. 2. In some aspects, the transmissioncomponent 904 may be co-located with the reception component 902 in atransceiver.

The identification component 908 may identify a plurality of cellsassociated with serving a UE. In some aspects, the identificationcomponent 908 may include one or more antennas, a demodulator, a MIMOdetector, a receive processor, a modulator, a transmit MIMO processor, atransmit processor, a controller/processor, a memory, or a combinationthereof, of the base station or the UE described above in connectionwith FIG. 2. The transmission component 904 may transmit an indicationof the plurality of cells associated with serving the UE to anotherwireless communication device.

The identification component 908 may identify a plurality of cell groupsassociated with serving a UE. In some aspects, the identificationcomponent 908 may include one or more antennas, a demodulator, a MIMOdetector, a receive processor, a modulator, a transmit MIMO processor, atransmit processor, a controller/processor, a memory, or a combinationthereof, of the base station or the UE described above in connectionwith FIG. 2. The transmission component 904 may transmit an indicationof the plurality of cell groups associated with serving the UE toanother wireless communication device.

The number and arrangement of components shown in FIG. 9 are provided asan example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 9. Furthermore, two or more components shown inFIG. 9 may be implemented within a single component, or a singlecomponent shown in FIG. 9 may be implemented as multiple, distributedcomponents. Additionally or alternatively, a set of (one or more)components shown in FIG. 9 may perform one or more functions describedas being performed by another set of components shown in FIG. 9.

FIG. 10 is a block diagram of an example apparatus 1000 for wirelesscommunication. The apparatus 1000 may be a wireless communication device(e.g., a base station or a UE), or a wireless communication device mayinclude the apparatus 1000. In some aspects, the apparatus 1000 includesa reception component 1002 and a transmission component 1004, which maybe in communication with one another (for example, via one or more busesand/or one or more other components). As shown, the apparatus 1000 maycommunicate with another apparatus 1006 (such as a UE, a base station,or another wireless communication device) using the reception component1002 and the transmission component 1004. As further shown, theapparatus 1000 may include one or more of an update component 1008,among other examples.

In some aspects, the apparatus 1000 may be configured to perform one ormore operations described herein in connection with FIGS. 3 and 6.Additionally or alternatively, the apparatus 1000 may be configured toperform one or more processes described herein, such as process 500 ofFIG. 5, process 800 of FIG. 8, or a combination thereof. In someaspects, the apparatus 1000 and/or one or more components shown in FIG.10 may include one or more components of the base station or the UEdescribed above in connection with FIG. 2. Additionally, oralternatively, one or more components shown in FIG. 10 may beimplemented within one or more components described above in connectionwith FIG. 2. Additionally or alternatively, one or more components ofthe set of components may be implemented at least in part as softwarestored in a memory. For example, a component (or a portion of acomponent) may be implemented as instructions or code stored in anon-transitory computer-readable medium and executable by a controlleror a processor to perform the functions or operations of the component.

The reception component 1002 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 1006. The reception component1002 may provide received communications to one or more other componentsof the apparatus 1000. In some aspects, the reception component 1002 mayperform signal processing on the received communications (such asfiltering, amplification, demodulation, analog-to-digital conversion,demultiplexing, deinterleaving, de-mapping, equalization, interferencecancellation, or decoding, among other examples), and may provide theprocessed signals to the one or more other components of the apparatus1006. In some aspects, the reception component 1002 may include one ormore antennas, a demodulator, a MIMO detector, a receive processor, acontroller/processor, a memory, or a combination thereof, of thewireless communication device described above in connection with FIG. 2.

The transmission component 1004 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 1006. In some aspects, one or moreother components of the apparatus 1006 may generate communications andmay provide the generated communications to the transmission component1004 for transmission to the apparatus 1006. In some aspects, thetransmission component 1004 may perform signal processing on thegenerated communications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 1006. In some aspects, the transmission component 1004may include one or more antennas, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the wireless communication device describedabove in connection with FIG. 2. In some aspects, the transmissioncomponent 1004 may be co-located with the reception component 1002 in atransceiver.

The reception component 1002 may receive an indication of a plurality ofcells associated with serving a UE from another wireless communicationdevice. The update component 1008 may update a list of serving cells ofthe UE based at least in part on the indication. In some aspects, theupdate component 1008 may include one or more antennas, a demodulator, aMIMO detector, a receive processor, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the base station or the UE described above inconnection with FIG. 2.

The reception component 1002 may receive an indication of a plurality ofcell groups associated with serving a UE from another wirelesscommunication device. The update component 1008 may update a list ofserving cell groups of the UE based at least in part on the indication.In some aspects, the update component 1008 may include one or moreantennas, a demodulator, a MIMO detector, a receive processor, amodulator, a transmit MIMO processor, a transmit processor, acontroller/processor, a memory, or a combination thereof, of the basestation or the UE described above in connection with FIG. 2.

The number and arrangement of components shown in FIG. 10 are providedas an example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 10. Furthermore, two or more components shownin FIG. 10 may be implemented within a single component, or a singlecomponent shown in FIG. 10 may be implemented as multiple, distributedcomponents. Additionally or alternatively, a set of (one or more)components shown in FIG. 10 may perform one or more functions describedas being performed by another set of components shown in FIG. 10.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, and/or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, and/or acombination of hardware and software.

As used herein, satisfying a threshold may, depending on the context,refer to a value being greater than the threshold, greater than or equalto the threshold, less than the threshold, less than or equal to thethreshold, equal to the threshold, not equal to the threshold, and/orthe like.

It will be apparent that systems and/or methods described herein may beimplemented in different forms of hardware, firmware, and/or acombination of hardware and software. The actual specialized controlhardware or software code used to implement these systems and/or methodsis not limiting of the aspects. Thus, the operation and behavior of thesystems and/or methods were described herein without reference tospecific software code—it being understood that software and hardwarecan be designed to implement the systems and/or methods based, at leastin part, on the description herein.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims and/or disclosed in the specification. Although each dependentclaim listed below may directly depend on only one claim, the disclosureof various aspects includes each dependent claim in combination withevery other claim in the claim set. A phrase referring to “at least oneof” a list of items refers to any combination of those items, includingsingle members. As an example, “at least one of: a, b, or c” is intendedto cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combinationwith multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c,a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering ofa, b, and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the terms “set” and “group” are intended to include oneor more items (e.g., related items, unrelated items, a combination ofrelated and unrelated items, and/or the like), and may be usedinterchangeably with “one or more.” Where only one item is intended, thephrase “only one” or similar language is used. Also, as used herein, theterms “has,” “have,” “having,” and/or the like are intended to beopen-ended terms. Further, the phrase “based on” is intended to mean“based, at least in part, on” unless explicitly stated otherwise.

What is claimed is:
 1. A method of wireless communication performed by a first wireless communication device, comprising: identifying a plurality of cells associated with serving a user equipment (UE), wherein each cell of the plurality of cells has been either selected for serving the UE or deselected for serving the UE; and transmitting an indication of the plurality of cells associated with serving the UE to a second wireless communication device, wherein the indication includes information indicating whether each cell of the plurality of cells has been selected for serving the UE or has been deselected for serving the UE.
 2. The method of claim 1, wherein, for a given cell of the plurality of cells, the indication includes information that identifies the given cell.
 3. The method of claim 1, wherein, for a given cell of the plurality of cells, the indication includes a cell group identifier associated with a cell group of the given cell.
 4. The method of claim 1, wherein, for a given cell of the plurality of cells, the indication includes a cell type indicator associated with the given cell.
 5. The method of claim 1, wherein, when a given cell of the plurality of cells has been selected for serving the UE, the indication includes information indicating that the given cell is to be added to a list of cells for serving the UE.
 6. The method of claim 1, wherein, when a given cell of the plurality of cells has been deselected for serving the UE, the indication includes information indicating that the given cell is to be removed from a list of cells for serving the UE.
 7. The method of claim 1, wherein the information indicating whether each cell of the plurality of cells has been selected for serving the UE or has been deselected for serving the UE includes a list of cells selected for serving the UE.
 8. The method of claim 1, wherein the plurality of cells is a plurality of cell groups.
 9. A first wireless communication device for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: identify a plurality of cells associated with serving a user equipment (UE), wherein each cell of the plurality of cells has been either selected for serving the UE or deselected for serving the UE; and transmit an indication of the plurality of cells associated with serving the UE to a second wireless communication device, wherein the indication includes information indicating whether each cell of the plurality of cells has been selected for serving the UE or has been deselected for serving the UE.
 10. A method of wireless communication performed by a second wireless communication device, comprising: receiving an indication of a plurality of cells associated with serving a user equipment (UE) from a first wireless communication device, wherein the indication includes information indicating whether each cell of the plurality of cells has been selected for serving the UE or has been deselected for serving the UE; and updating a list of serving cells of the UE based at least in part on the indication.
 11. The method of claim 10, wherein, for a given cell of the plurality of cells, the indication includes information that identifies the given cell.
 12. The method of claim 11, wherein the information that identifies the given cell includes at least one of a serving cell identifier or a physical cell identifier.
 13. The method of claim 10, wherein, for a given cell of the plurality of cells, the indication includes a cell group identifier associated with a cell group of the given cell.
 14. The method of claim 13, wherein the cell group is a primary cell group or a secondary cell group.
 15. The method of claim 10, wherein, for a given cell of the plurality of cells, the indication includes a cell type indicator associated with the given cell.
 16. The method of claim 15, wherein the cell type indicator indicates whether the given cell is a primary cell, a secondary cell, or a primary secondary cell.
 17. The method of claim 15, wherein the cell type indicator indicates whether the given cell is a physical uplink control channel (PUCCH) cell or a non-PUCCH cell.
 18. The method of claim 10, wherein, when a given cell of the plurality of cells has been selected for serving the UE, the indication includes information indicating that the given cell is to be added to a list of cells for serving the UE.
 19. The method of claim 10, wherein, when a given cell of the plurality of cells has been deselected for serving the UE, the indication includes information indicating that the given cell is to be removed from a list of cells for serving the UE.
 20. The method of claim 10, wherein the information indicating whether each cell of the plurality of cells has been selected for serving the UE or has been deselected for serving the UE includes a list of cells selected for serving the UE.
 21. The method of claim 10, wherein the indication is received via radio resource control signaling.
 22. The method of claim 10, wherein the indication is received via a medium access control control element.
 23. The method of claim 10, wherein the indication is received via downlink control information.
 24. The method of claim 10, wherein the plurality of cells is a plurality of cell groups.
 25. The method of claim 24, wherein, when a given cell group of the plurality of cell groups has been selected for serving the UE, the indication includes information indicating that the given cell group is to be added to a list of cell groups for serving the UE.
 26. The method of claim 24, wherein, when a given cell group of the plurality of cell groups has been deselected for serving the UE, the indication includes information indicating that the given cell group is to be removed from a list of cell groups for serving the UE.
 27. The method of claim 24, wherein the information indicating whether each cell of the plurality of cells has been selected for serving the UE or has been deselected for serving the UE includes a list of cell groups selected for serving the UE.
 28. The method of claim 10, wherein the first wireless communication device is a base station and the second wireless communication device is the UE.
 29. The method of claim 10, wherein the first wireless communication device is the UE and the second wireless communication device is a base station.
 30. A second wireless communication device for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: receive an indication of a plurality of cells associated with serving a user equipment (UE) from a first wireless communication device, wherein the indication includes information indicating whether each cell of the plurality of cells has been selected for serving the UE or has been deselected for serving the UE; and update a list of serving cells of the UE based at least in part on the indication. 